Effect of Electronic Structure on Delayed Fluorescence in Mn-Doped Perovskite Nanocrystals
Vibrationally assisted delayed fluorescence (VADF) in perovskite nanocrystals (NCs) has been recently demonstrated as the delayed excitonic emission arising due to the strong vibrational coupling between Pb and Mn levels leading to the back-transfer of photoexcited carriers. While the efficiency of...
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| Published in: | Journal of physical chemistry. C Vol. 126; no. 23; pp. 9813 - 9819 |
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| Main Authors: | , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
American Chemical Society
16-06-2022
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| Subjects: | |
| Online Access: | Get full text |
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| Summary: | Vibrationally assisted delayed fluorescence (VADF) in perovskite nanocrystals (NCs) has been recently demonstrated as the delayed excitonic emission arising due to the strong vibrational coupling between Pb and Mn levels leading to the back-transfer of photoexcited carriers. While the efficiency of VADF is known to depend on the host, its dependence has been assumed to be largely on the band gap. The effect of electronic structure beyond the band gap is so far unknown. In this work, we have studied the effect of electronic structure on VADF through composition modulation and quantum confinement in Mn-doped perovskite NCs without changing the band gap. The efficiency of VADF as a function of temperature, quantified using the entropy of VADF, is found to depend on the entire electronic structure. Gated photoluminescence excitation *(PLE) studies prove that the back-transfer of photoexcited electrons is assisted by state-specific higher excited levels that remain unchanged during size variation. |
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| ISSN: | 1932-7447 1932-7455 |
| DOI: | 10.1021/acs.jpcc.2c01705 |